There are few things more enjoyable on the Fourth of July than spending the afternoon outdoors waiting for another sizzling hot wiener to come off the grill, am I right? And the best part about hot dogs -- other than the fact that they're delicious -- is that we're able to enjoy them despite not really knowing exactly what's in them. So to clear things up, but hopefully not burst your hot dog-loving bubble, here's what you're actually putting in your tummy: